Hanging scaffold.



PATENTED JUNE 13, 1905.

W. H. MORROW.

HANGING SUAFFOLD.

APPLICATION FILED JUNE 16,1904.

2 SHEETS-SHEET 1.

N0. 792,341. PATENTED JUNE 13, 1905.

W H. MORROW.

HANGING SOAPFOLD.

APPLICATION FILED JUNE 16-, 1904.

2 SHEETS-SHEET 2.

UNITED STATES Patented June 13, 1905.

\VILLIAM H. MORROWV, OF NEW YORK, N. Y.

HANGING SCAFFOLD.

SPECIFICATION forming part of Letters Patent No. 792,341, dated June 13, 1905.

Application filed June 16,1904. Serial No. 212,771.

To ctlZ whom it may concern.-

Be it known that I, WVILLIAu H. Monnow, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Hanging Scaffolds, of which the following is a specification sufficient to enable others skilled in the art to which the invention appertains to make and use the same.

The object of my invention is to afford a simple and inexpensive hanging scaffold for use in connection with the skeleton framework of buildings in course of construction and to provide suitable means for the convenient and immediate adjustment of the scaffold to any height desired to meet the requirements of use, so that the work done upon or from the scaffold can be accomplished to the best advantage and with the greatest economy of time. Thus by the use of my improved hanging scaffold work may be conducted continuously without the interruption, labor, and delay involved under present methods in raising the platform several feet at a time from one level to another, necessitating unloading in whole or in part, reloading, and the loss of the mens timeobjections which I overcome by my invention.

Another object of my invention is to insure the absolute security of the scaffold and the safety of those using it.

The invention consists, essentially, in the construction and arrangement of parts hereinafter described and claimed specifically.

In the accompanying drawings, Figure l is an elevation illustrating more or less diagrammatically the use of my improved hanging scaffold. Fig. 2 is a top view of my scaffold suspending and adjusting mechanism. Fig. 3 is a vertical longitudinal section upon plane of line 3 3, Fig. 2. Fig. 4 is a section upon plane of line 4: 4, Fig. 2.

In the drawings, A represents the skeleton framework of a building in course of erection, to the upper girders or beams a a of which is secured, by bolts 6 or other suitable means, my scaffold supporting and adjusting mechanism, consisting of the string-pieces C 5 G and cross members 0 c, the parts of the alinement with the ratchet-wheels t t.

framework thus formed being held rigidly together by means of bolts (Z (Z, passing transversely through the stringers C C and longitudinally through the cross members 0 0, respectively.

S S are sprocket chain-wheels rigidly secured to shafts e e and formed with sprocketteeth .9 s for engagement with the links Z of the supporting-chains L, one extremity ofv each of which latter is secured to an eyebolt p on the platform P. The shafts e e are journaled in the upper side of the stringers C C and secured thereto by caps c 0. Their outer extremities are square in cross-section or otherwise formed for engagement with a ratchetlever R or equivalent mechanical expedient by \(illICll the shafts may be rotated when desire Secured rigidly to the shafts e e or to the chain sprocket-wheels S S are ratchet-wheels t t, with which engage pawls 2' a", mounted upon bolt-rods it h, which also carry spacingtubes ff, by which the pawls c' c" are held in Stops a a on the stringers S S limit the motion of the pawls 2', so that they cannot be thrown out of engagement with the ratchet-wheel teeth accidentally or otherwise. It is thus obvious that the pawls c" by reason of their constant engagement with the ratchets will prevent any retractile movement of the chain sprocket-wheels C C, and thus sustain the platform in its prescribed position; but in order to guard still further against accident or displacementI secure the free ends Z or bights of the suspending-chains L L to hooks m m upon the taut or suspending bights Z of said chains L L, as shown in Fig. 1 of the drawings, it being understood that said hooks or equivalent holding device may be secured to the platform P or other suitable support, if desired, with like result. Thus if by any chance a chain should slip or become disengaged from its sprocket wheel the chain would be still held taut and sustain the platform in a safe position.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a device of the character designated, parallel string-pieces bolted together, means for securing them to the framework of a build ing in course of construction, sprocket chainwheels mounted on and between said stringpieces, ratchetwheels connected with said sprocket chain-wheels, pawls engaging said ratchet-wheels, Suspender-chains engaging with said chain sprocket-wheels, rigidly-secured hooks at intervals on said suspenderchains for engaging the free end of the same, and a platform hung upon said suspenderchains, substantiallyin the manner and for the purpose described.

2. In a device of the character designated, string-pieces with means for securing them in position, sprocketwheels with their shafts supported by the string-pieces, ratchet-andpawl mechanism supported on the stringpieces, chains passed over said sprocket-wheels and a platform having each end independently supported by a chain, and hooks rigidly secured to said chains and held parallel therewith for engaging the links of the free portions of the chains upon the other side of the aXes of the sprocket-wheels to prevent them from lowering the platform in case the pawls break.

3. Theimproved hanging scaffold herein described comprising horizontal string-pieces with transverse connecting members, shafts mounted on said string pieces, sprocket wheels on said shafts, a platform, chains each having one end secured to said platform the other ends being passed over said sprocketwheels, means for securing one end of said string-pieces to the framework of a building, means for rotating said shafts, means for holding them against retrograde movement and means on the suspending-bights of said chains intermediate their connection with the platform and the sprocket-wheels for engagement with means on the free ends of said chains for sustaining the platform and for holding the chains taut if they become disengaged from the sprocket-wheels.

WILLIAM H. MORROI/V.

Witnesses:

' GEO. WM. MIATT, D. W. GARDNER. 

